Changed remaining instances of implicit bool casts to explicit lodash calls

packages/utils/src/abi_encoder/abstract_data_types/types/pointer.ts

@@ -21,7 +21,7 @@ export abstract class Pointer extends DataType {
     }
 
     public generateCalldataBlock(value: any, parentBlock?: CalldataBlock): CalldataBlocks.Pointer {
-        if (!parentBlock) {
+        if (_.isUndefined(parentBlock)) {
             throw new Error(`DependentDataType requires a parent block to generate its block`);
         }
         const destinationBlock = this._destination.generateCalldataBlock(value, parentBlock);

packages/utils/src/abi_encoder/calldata/blocks/set.ts

@@ -14,7 +14,7 @@ export class Set extends CalldataBlock {
 
     public getRawData(): Buffer {
         const rawDataComponents: Buffer[] = [];
-        if (this._header) {
+        if (!_.isUndefined(this._header)) {
             rawDataComponents.push(this._header);
         }
         _.each(this._members, (member: CalldataBlock) => {
@@ -35,7 +35,7 @@ export class Set extends CalldataBlock {
     }
 
     public toBuffer(): Buffer {
-        if (this._header) {
+        if (!_.isUndefined(this._header)) {
             return this._header;
         }
         return new Buffer('');

packages/utils/src/abi_encoder/evm_data_type_factory.ts

@@ -2,6 +2,7 @@
 /* tslint:disable max-classes-per-file */
 /* tslint:disable no-construct */
 import { DataItem, MethodAbi } from 'ethereum-types';
+import * as _ from 'lodash';
 
 import { DataType, DataTypeFactory } from './abstract_data_types';
 import * as Impl from './evm_data_types';
@@ -105,9 +106,9 @@ export class EvmDataTypeFactory implements DataTypeFactory {
             dataType = new String(dataItem);
         }
         // @TODO: Implement Fixed/UFixed types
-        if (!dataType) {
+        if (_.isUndefined(dataType)) {
             throw new Error(`Unrecognized data type: '${dataItem.type}'`);
-        } else if (parentDataType && !dataType.isStatic()) {
+        } else if (!_.isUndefined(parentDataType) && !dataType.isStatic()) {
             const pointerToDataType = new Pointer(dataType, parentDataType);
             return pointerToDataType;
         }